renderer/opengl: do not need to convert

src/renderer/opengl/image.zig

@@ -114,52 +114,12 @@ pub const Image = union(enum) {
         };
     }
 
-    /// Converts the image data to a format that can be uploaded to the GPU.
-    /// If the data is already in a format that can be uploaded, this is a
-    /// no-op.
-    pub fn convert(self: *Image, alloc: Allocator) !void {
-        switch (self.*) {
-            .ready,
-            .unload_pending,
-            .unload_ready,
-            => unreachable, // invalid
-
-            .pending_rgba => {}, // ready
-
-            // RGB needs to be converted to RGBA because Metal textures
-            // don't support RGB.
-            .pending_rgb => |*p| {
-                // Note: this is the slowest possible way to do this...
-                const data = p.dataSlice(3);
-                const pixels = data.len / 3;
-                var rgba = try alloc.alloc(u8, pixels * 4);
-                errdefer alloc.free(rgba);
-                var i: usize = 0;
-                while (i < pixels) : (i += 1) {
-                    const data_i = i * 3;
-                    const rgba_i = i * 4;
-                    rgba[rgba_i] = data[data_i];
-                    rgba[rgba_i + 1] = data[data_i + 1];
-                    rgba[rgba_i + 2] = data[data_i + 2];
-                    rgba[rgba_i + 3] = 255;
-                }
-
-                alloc.free(data);
-                p.data = rgba.ptr;
-                self.* = .{ .pending_rgba = p.* };
-            },
-        }
-    }
-
     /// Upload the pending image to the GPU and change the state of this
     /// image to ready.
     pub fn upload(
         self: *Image,
         alloc: Allocator,
     ) !void {
-        // Convert our data if we have to
-        try self.convert(alloc);
-
         // Get our pending info
         const p = self.pending().?;